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• W1982122912 endingPage "72" @default.
• W1982122912 startingPage "67" @default.
• W1982122912 abstract "1. The effects of the anticonvulsant, phenytoin, have been examined on N-methyl-D-aspartate (NMDA) receptor-mediated population spikes in the CA1 region of the rat hippocampus in vitro. 2. The 'conventional' (AMPA receptor-mediated) CA1 population spike, evoked by electrical stimulation of the Schaffer collateral/commissural pathway, was abolished by 5 min treatment with 5 x 10(-6) M 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX), after which superfusion with a nominally Mg(2+)-free Krebs solution (containing 5 x 10(-6) M CNQX) led to the appearance of an epileptiform population spike which was fully developed by 30-40 min. 3. The epileptiform population spike was abolished by the non-competitive NMDA antagonist, dizocilpine (1 x 10(-6) M, 20-30 min) and inhibited by the competitive NMDA receptor antagonist, D-CPP (IC50 for reducing the amplitude of the first spike in the train = 8.3 x 10(-7) M), demonstrating that the response was mediated by activation of NMDA receptors and validating its use as an assay for antagonists acting at the NMDA receptor/channel complex. 4. Phenytoin (0.1, 0.3 and 1 x 10(-4) M applied cumulatively for 30 min at each concentration) failed to inhibit the NMDA receptor-mediated epileptiform population response (n = 7 slices). 5. Phenytoin (3 x 10-6 M to 1 x 10-4M) attenuated the effects of the sodium channel activator,veratridine (2 x 10-6 M), on the CAl population spike amplitude (recorded in normal Krebs solution),indicating that the previously observed lack of effect of phenytoin on the NMDA receptor-mediated response was not due to impaired access of phenytoin to the biophase.6. These data support the conclusion that antagonism of NMDA receptor-mediated events is not a pharmacological property of phenytoin and that such an action is therefore unlikely to contribute to the anticonvulsant activity of this drug." @default.
• W1982122912 created "2016-06-24" @default.
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• W1982122912 date "1995-05-01" @default.
• W1982122912 modified "2023-10-16" @default.
• W1982122912 title "Electrophysiological actions of phenytoin on N-methyl-D-aspartate receptor-mediated responses in rat hippocampus in vitro" @default.
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• W1982122912 doi "https://doi.org/10.1111/j.1476-5381.1995.tb16320.x" @default.
• W1982122912 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1908748" @default.
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• W1982122912 hasPublicationYear "1995" @default.
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